MESON Chess Problem Database

Problem Display
PID: 87542 (3q4/PP1k1PP1/1nNpNn2/1P2BK2/2p1p3/8/8/6Q1 w - - 0 1)

Hoek, Willem

The Problemist, 1976

3q4/PP1k1PP1/1nNpNn2/1P2BK2/2p1p3/8/8/6Q1

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7
      • 2.Sf8#
    • 1...Qe7
      • 2.Sb8#
    • 1...Qb8
      • 2.axb8S#
    • 1...Qf8
      • 2.gxf8S#
    • 1...Sc8
      • 2.b8S#
    • 1...Se8
      • 2.f8S#
    • 1...d5
      • 2.Sc5#
  • Tries
    • 1.f8S+?
      • 1...Ke8
        • 2.Qg6#
      • 1...Qxf8!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxd6#
      • 1...dxc5
        • 2.Sxc5#
      • 1...dxe5
        • 2.Sxe5#
      • 1...Qc7
        • 2.Sf8#
      • 1...Qe7
        • 2.Sb8#
      • 1...Qb8
        • 2.axb8S#
      • 1...Qf8
        • 2.gxf8S#
      • 1...Sc8
        • 2.b8S#
      • 1...Se8
        • 2.f8S#
      • 1...d5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD,SBLOCK::S(F)
    • Q(g);N_GUARD,SBLOCK::S(E)
    • Q(g);OGATE::PXQ(g)=S
    • S(c);SBLOCK,S_CUTQ(g)::P=S
    • S(e);SBLOCK,S_CUTQ(g)::P=S
    • P(d);N_GUARD::S(F)
  • Tries
    • Try
      • P(I);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB(A)
      • Refutation
        • Q(g);XS(I)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A),XP(d)
    • Vars
      • P(d);XQ(A)::S(F),XP(d)
      • P(d);XB(C)::S(E),XP(d)
      • Q(g);N_GUARD,SBLOCK::S(F)
      • Q(g);N_GUARD,SBLOCK::S(E)
      • Q(g);OGATE::PXQ(g)=S
      • S(c);SBLOCK,S_CUTQ(g)::P=S
      • S(e);SBLOCK,S_CUTQ(g)::P=S
      • P(d);::QAR1(A)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).